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Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system

a voltage control and frequency shift keying technology, applied in pulse techniques, instruments, cameras, etc., can solve the problems of not being able to get more precise frequency spacing and further adjust frequency spacing, so as to achieve the effect of reducing errors in data transmission

Inactive Publication Date: 2008-06-10
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]The invention provides a FSK modulator, which includes switching varactor unit coupled with a VCO core in parallel, so that the operation frequency and the frequency spacing can be adjusted to the optimal condition. As a result, the errors occurring in data transmission can be effectively reduced.

Problems solved by technology

There is no way to further adjust the frequency spacing to get more precise frequency spacing.
Therefore, it is an issue about how to get more precise frequency spacing to represent the binary data.

Method used

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  • Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system
  • Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system
  • Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system

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Embodiment Construction

[0024]The present invention is directed to a VCO device, of which the characteristic frequency of VCO core can be shifted by coupling in parallel with a switching varactor unit. The switching varactor unit changes the frequency constant √{square root over (LC)} of the VCO core, so as to shift the operation frequency and the frequency spacing. In addition, the VCO device of the invention can be implemented into a FSK modulator, so that the operation frequency and the frequency spacing can be adjusted to the optimal condition. As a result, the errors occurring in data transmission can be effectively reduced. An example is provided for describing the features of the present invention as follows.

[0025]FIG. 3 is a circuit block diagram, schematically illustrating configuration of a FSK system, according to one preferred embodiment of this invention. In FIG. 3, the FSK system or FSK modulator includes a frequency selection unit 100, a VCO unit 200, buffers 38a, 38b, and a PLL unit 40.

[002...

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Abstract

A voltage controlled oscillator (VCO), suitable for use in a frequency shift keying (FSK) system. The VCO device comprises a switching varactor unit, having a first terminal and a second terminal, wherein the switching varactor unit produces a capacitance, according to a frequency-selection voltage. A VCO core has a first output terminal, a second output terminal complementary to the first output terminal, and an input terminal. Wherein, the switching varactor unit is coupled in parallel with the VCO core at the first output terminal and the second output terminal to produce a capacitance effect with respect to the capacitance, so as to adjust a frequency constant √{square root over (LC)} of the VCO core.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]The present invention relates to a frequency shift keying (FSK) modulator. More particularly, the present invention relates to a voltage controlled oscillator (VCO) suitable for use in a FSK system.[0003]2. Description of Related Art[0004]An oscillator is an electric or electronic circuit that produces an output signal that oscillates at a principal oscillation frequency and, in some instances, contains harmonic frequency signals (i.e., signals having frequencies that are multiples of the principal oscillation frequency). Some oscillators have a principal oscillation frequency that may be varied by the application of a suitable control voltage. Oscillators of this type, called voltage-controlled oscillators or VCO's, are used in many communication and other signal-processing applications. Because suppression or reduction of higher-order harmonics of the principal oscillation frequency and other noise in the output signal of...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04L27/14H03D3/00H04L27/12
CPCH04L27/12
Inventor TU, YIH-MINCHEN, YUNG-LUNGPENG, YUAN-TUNGLEE, FAN-CHUNG
Owner NOVATEK MICROELECTRONICS CORP
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